Vot. II, Pr. IT] LOOMIS—A REVIEW OF THE TUBINARES Sy 
hollow in the soil at the end of a small cave in a hillside. Seven 
young birds in various stages of down were obtained in similar 
situations. 
Immediately south of the archipelago, Mr. Gifford records 
these petrels daily from the 6th to the 12th of May, 1906. On 
the 8th twenty were seen. Several were taken about 2 P. M., 
and the stomachs of some of them contained considerable food. 
All were in good plumage and had partially enlarged sexual 
ergans. During a cruise south of the archipelago, nearly a 
month later, these petrels were met with again. When cap- 
tured, they eject an orange-colored oil. In no instance were 
they heard to utter a note. 
On the home voyage Mr. Beck shot a male (No. 496 C. A. 
S.) on November 9, 1906, in latitude 30° 30’ N., longitude 
130° 55’ W., a position favorable for the occurrence of birds 
breeding in the Hawaiian Islands. 
According to Mr. Gifford, Harcourt’s Petrel and the Gala- 
pagos Petrel can be distinguished on wing by the difference in 
size and by the shape of the white patch at the base of the tail, 
this patch in the Galapagos Petrel forming an isosceles triangle 
and in Harcourt’s Petrel a sort of band. 
On the eastern side of the Atlantic, this petrel has been found 
on more than one occasion north of its breeding range. When 
its life-history is better known, it may be revealed that it has 
a migration northward after the breeding season. 
The usual point-of-wing-formula is: primary 2>3>1>4. 
In life the bill, feet, and orbital ring are black (slightly 
brownish in young birds) and the irises dark brown (Gifford). 
The seven nestlings show the transition from the natal down 
to the definitive feathers. In No. 520, female, the primary 
natal down is much worn and definitive feathers are making 
their appearance on the breast and scapulars, and the upper tail- 
coverts are emerging. The throat is quite bare in this specimen 
and in the following one. No. 519, female, is further along. 
‘Hidden beneath the natal down, definitive feathers are develop- 
ing on the lower jugulum, breast, flanks, and upper surface of 
the body. The white upper tail-coverts are becoming prom- 
inent, and the wings and tail are taking form. No. 518, male, 
is a step in advance. The wings and tail are more developed, 
